Engine timing means



Patented Dec. 1, 1931 UNITED STAA-TE'SL-PAFTE Nr OFFICE MORRIS J. eoLmaEne, or IBELQIT, Wisconsin, As'srenoa ro FAInBANKs, monsna 00, Y onomoaeo, rumors, a CORPORATION or ILLINOIS nnemnrmlne MEANS This invention relates to improvements in j engine tlming means, and particularly to timing. compensation means adapted for use on oil enginesof the reversible type, in order to maintain the injectiontiming, ineither direction of. rotation of such engines.

In order to attain the best performance of engines of the solid injection type, it is essential that the timing of the oil injection be adjustable with precision, and further, that when the adjustment or setting is once determined, that it be maintained substantially constant for either direction of engine rotation.

An object of the present invention is, therefore, to provide an improved timing means, in which is embodied means for adjusting, for timing purposes, the driving connection to the fuel injection pumps, and which includes provisions for maintaining such adjustment. V

A further object is to provide an improved engine timing device, which when once adj usted and set in a certain timed relation with respect to the engine,'maintains such setting irrespective of any and all rotational reversals of the engine.

A still further object is to provide an improved oil engine timing apparatus which is neat and compact in arrangement, which will provide for ease of assembly, and which'is economical to construct and maintain.

Furtherobj ectsand advantages will appear from the following detailed description of parts, and the accompanying drawings, in

which Fig. 1 is a view in elevation. partially broken away, of the improved timing device; and Fig. 2 is a section taken along the line 22 of Fig. 1. v

It will, of course, be understood that the present detailed description of parts and the accompanying drawings,'-relate to a single preferred executional embodiment of the present invention, and that substantial alterations may be made in the described construction and arrangement of the parts, without departing from the spiritand full scope of the invention. V 7

Referring by numerals to the drawings, 10 designates a cam shaft upon which is keyed orotherwise secured, the usual cams or the like, ,for actuating the fuel injection pump rods. (not shown). A- disk or supporting plate 12 is preferably keyed to the shaft 10 and rotatable therewith. Upon a hub portion 13 of the plate 12, a supporting bracket 14 is preferably looselyand rotatably mounted, and is arranged to rotate with the shaft '10, by means of bolts 15 or the equivalent, which clamp the bracket 14 to the plate 12. Thebracket or supporting spider 14 is enclosed by and clamped to an annular plate 16. Slottedopenings 17 are provided in the plates 12 and .16 to permit angular adjustment of the bracket 14, relatively to the plates, so

that the bracket may be moved and clamped in any angular position within the range of the slotted openings 17. This provision permits precision adjustment between the related parts, for a purpose that will hereinafter appear.

A gear 18 is rotatably supported on the peripheries 19 of the plates 12 and 16, and the gear is maintained in position by an internally projecting portion 20 of the gear, which,

although permitting free rotational .movement between the plates and gear, precludes any lateral movement of the gear. The gear 18 is provided, by preference, with a plurality ofrecessed portions 21 which serve to form opposed contact faces 22 and 23 for a purpose that will hereinafter'appear. I I

The bracket 14: is provided, by preference, with, projecting bifurcated lug portions 24 upon which are hingedly mounted, block elementsi-25 means of pivot pins 26 or-the' equivalent. These block elements are ar- By reason of the hinged mounting of the contact blocks, a self-aligning relation is always which'is positioned a coilspring 30, which exerts a slight spring pressure upon the ad'' jacent surface of the bracket. The. gear 18.

may be bored internally to form a substan tially cylindrical surface-31,and likewisethe outer portions 32 of each element 27, may be shaped to snugly engage the bore. It will readily be seen that the pressure applied by each of'the springs 30, urges the correspond ing elements 27 into slida-bl'e and frictional 26 contact with the bore, and thus prevents -un intentional and casual relative movements of the bracket'an'd gear. This frictional resist-- 'ance, offered by the weights 27,1is not sulficient to prevent, or interfere with, the or-- dinary operating movement of'these related parts, which, as will appear, takes place upon reversing the engine. a

, The device is very simple and positive-in operation. I The gear 18 is driven f'rom-a'mat mg gear (not shown mounted, for example,

on the engine crank-shaft, and thereby provides for rotationof the gear 18 i'n timed relation with the engine. Movement of the gear 18 is transmitted to the shaft 10, by thedriving-relation which exists'betweenthe rim of the gear, and theblock elements 25- of thebracket 1 f. This driving connection is produced by the impingement, for example dur' ing forward rotation of the engine, of the face's of the recesses 21, upon the correspond ing faces of the block elements 25. YVhen this occurs, the entire assembly rot-atesjas aunit, causing the" cams to actuate the injection pump, in the usual manner", in timed relationwith the eng ine. As the engine speed in creases, the weights 27 are urged outwardly' by centrifugal force, and the springs 30, against the internal cylindrical surface 31 of the gear, and thus tend to lock the gear tothe" bracket to prevent relative movementtherebetween. This rotation of the shaft 10 con tinues until the-direction of rotation'of the engine crank-shaffiis changed, or the engine.

is reversed. Upon reversal, the gear 18 being geared-to the engine, immediately rotates in the reverse direction with the engine; but the bracket 1& and its relatedparts, with the shaft 10,v remains stationary foratime, thus permitting the crank-shaft to rotate a predeterminedangular distance, before the opposite faces 23 of the recess 21 impinge upon. the block element 25. It will be readily understood that thisautomatic retardation of 651 the camshaft 10,.allowsfthe engine crankshaft to rotate, independently of the cam shaft, the desired angular distance to insure the proper timing of the cams after beginning reverse rotation. Such a lost-motion driving connection constitutes a means for maintaining the proper timing relation be tween the crank shaft and the injection cams, in either direction of rotation: of the engine.

lntiming the injection, a coarse adjustment of camshaft 10, within a range or limit of one tooth of the gear, effected in theusual mannor, by properly relating the gear 18 with the. ,cra.nk shaft gear. The present example o f 'the invention provides a liner adjustment .through theuse of slotted openings 17 in the plates 12 and 16, which, with the bolts 15, permits angular adjustment of. the: bracket 14 with respect to the shaft 10, and further permits the angular displacement of the block elements 25', which changes the point'of actuation of the. cam shaft by these elements. It will readily be seen that a finer adjustment is provided. by thesemeans," than merely by shifting the gear, one toothv at a time When the proper. setting'of the-cam shaft. has been found,.this setting is maintained by" the provision of the springs 30, which urge the elements 27 outwardly into frictional engagement withthe interior-al enate surface of thebore in the gear 18. This provision prevents any casual disturbance of the proper setting of parts, due toback lash, or inertia eifectsin the system.

It will readily be seen that the partsare so disposed as to form a neat, compact and substantially enclosed: assembly- The movable parts inside of the assembly are detachable, as a unit, from: the shaft 10, by'theremoval of theb'ol'ts 15.. The plate 12'.is also-removable, to permitthe entire assembly to be r withdrawn: from: the shaft 10,. upon the removal: of the plate 33,:whi'chsecures. the plates 12 against movement along the shaft.

The parts of the present'device are simple and inexpensive to make and assemble, and are arranged to facilitate replacement in case of any necessary repair; "The device is composed ofbut few rotating and wearing parts, and provides eonvenient,.- practical means for automatically timing an engine in a manner to insure the same engine performance'and efficiency. ineither direction of. rotation.

It will be seen front thezdrawings thatthe present example employs. practically all the space available within the gear 18,: for the small amount of added mech anism incid'ental to the present invention. In: this manner, an automatic timing'me'ans-forxreversing engines,'may be added as an accessory ilOGXiSting power units, without providing extra housings or other space accommodations therefor. I

- I claim as my invention .1, In an injection-timing device for 'inter nal combustion engines',-a' cam shaft, a gear arranged for driving said cam shaft, a

bracket adjustably secured to said cam shaft, and having a plurality of arms; there being recesses in said gear adaptedto receive said arms, said arms and recesses beingrelated for lost-motion driving engagementbetween said gear and said bracket.

2. In an injection-timing device for reversible internal combustion engines, a shaft for controliing supply fuel to said engine, a gear in driving relation with said shaft, a

racket carried by the shaft substantially internally of the gear, means forming a recess in said gear, and a pivoted projection on said bracket positioned within the recess, the recess being of greater angular extent than said projection whereby to effect a delayed lriring engagement between said bracket and said f, upon rei ersing the engine.

3. I timing device for reversible engines, a cam shaft, a bracket secured to said cam shaft, projecting portions carried by the bracket, a gear having internally recessed portions, and members pivotally secured to said portions for rocking movement within the recesses upon effectinga driving connection between said projecting portions and the recesses in said gear. 7

4. In a timing device for reversible engines a shaft operable in timed relation with the engine, an engine driven member operatively associated with said shaft, means substantially enclosed within said member for effectin g a lost-motion driving engagement between said member and said shaft, upon change in direction of rotation of the engine, and a spring-pressed member normally tending to effect a positive driving engagement between said driven member and said shaft.

5. In an injection-timing device for .re-. versible internal combustion engi es, a cam shaft, a member operatively related'to the engine and means providing for rotation of said member, within limits, with respect to the cam shaft, and centrifugally-actuated means tending to prevent relative rotation between said member and shaft. p

G. In an injection-timing device for inter nal combustion engines, a cam shaft, a gear operatively related to the engine and having an internal recess, means carried by the cam shaft including a member pivotally mounted within said recess, providing'for restrictedrotation of the gear with respect to said cam shaft, and spring-pressed means tending to prevent relative rotation between said mem her and said cam shaft.

7. An injection-timing device for reversible internal combustion engines, including a shaft, a gear operatively associated with the engine for actuating said shaft, means providing for a limited rotation of the gear relative to said shaft upon reversing the engine,

and combined springand centrifugally-ac tuated means, tending to prevent relative ro shaft, a member rotatably mounted on said bracket and operatively associated with the engine, means for operatively connecting said member and bracket in lost-motion relation, and frictional engaging means, tending to prevent relative movement between said member and said bracket.

' 9. In a timing device for reversible engines, a cam shaft, 2. gear for driving said camshaft, means forming a lost-motion drivmg connection betweensaid shaft and gear,

' a spring pressed friction member engaging a surface internal of the gear, and tending to prevent the action of said lost-motion connection, and means whereby each of the aforesaid means is substantially enclosed within said gear and removable therewith, as a unit, from said shaft.

10. In a timing devicefor reversible internal combustion engines, a shaft for controlling the delivery of fuel to the engine, means for maintaining the timed relation of said shaft to the engine in either direction of rotation, a gear, a friction block pivotally connectedto said shaft, and engaging a friction surface internal of the gear, said gear forming a housing for said means, and arranged for operatively connecting said shaft with the engine.

' 11. In a charge-timing device for reversible internal combustion engines, a cam shaft adapted to actuate a fuel pump, a bracket carried by said cam shaft, a cam-shaft gear MORRIS J. GOLDBERG. 

